<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div id="app">{{ book }}</div>
    <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
    <script>
       var app = new Vue({
           el:'#app',                          //     {{ }} 的作用
           data:{
               book:'《Vue.js 实战》'
           }
       })    
    </script>
</body>
</html>